May concern



' E. LAASS. Furnace for Evaporating Pans.

' Patented June 2 3868u EMIL LAASS, 0F SYRACUSE, NEW YORK.

Letters Pcte'ntil 78,527, dated June 2,1868.

IMPROVEMENT" IN ARGHES 0F FURNACES FOR EVAPORATINGEETTLES, Sac.

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TO ALL WHOM IT MAY OQNGE R'N:

Be it known that I, EMIL LAASS, of Syracuse, in the county of Onondaga,and State of New York, have invented a certain new and usefulImprovement in Portable and Adjustable Arches for Furnaces, 830.; and Ido hereby declare that the following is o full and exact descriptionthereof, reference being;- had to the accompanying drawings, making portof this specification.

Figures 1, 2, and 3 are equivalent forms of my iniproved arch.

Figure 4, a view representing a furnace with a series of the arches inuse.

Like letters of reference indicate corresponding parts in all thefigures.

My invention consists of an arch constructed in sections, connected atthe centre la it loose cylindrical keystone, and resting at the base onstraight ahutinen ts or ways,,thowhole' so arranged that the arch may henioi'ed out or in to any position, or taken apart, at plensure. Thisconstruction is more especially adapted to use in'furnaces forequalizing the heat, as will presently be: described.

In the drawings, i i A represent the sections of the arch join-ted atthe crown by a loesecylimlricnl keystone, B, which fits in hall socketsoi the sections, and allows each section to more indopondehtly of itsfellow, eithcr vertically or longitudinally. If desired, each of thesesections may consist of more than one piece, as shown in fig. 3. i

The bases orends'ot' the sections are made either convex, to rest in theconcai'e w: C C, as shown in fig. 1, or concave, to rest upon theconvex'ways of the abutme'nts, as in indrical block interposed, as infig. 3; the hearing-surfaces in either case being formed in allow tl1e,arch to be moved forward or back on the ways.

.The arches thus constructed and arranged are both portable andadjustable, and tha are specially adapted to use in anevaporating-furl:ace, E, as shown in fig. 4, in which it-is desirable toequalize the heat under the kettles D D. Over the lire-grate the .archcsare moved close together, so as to obstruct the tire, while farther inthey are adjusted to a greater distance apart, to allow a free heat. I

It is only-by making the arches in sections, :and arranging thornloosely at both the crown and spring, that they can be made availablefor this purpose, since they are to he slid out and in frequently, andit is sometimes necessary to move-one side or section of an arch withoutmori-n'g its fellow. It will be seen that this is accomplished withoutdiflieulty, for the keystone is a straight cylinder, which allows both ain. sliding one to either section, independent of the other.

This arljustahility allows the, arches to be inserted or removed beneaththe kettles with: taking thekettles from place, and the loose connectionboth at top and bottom allows each section to he sha or moved out or inindependently, to the propcr'degree to remove ashes that collect on thetop. When the arches it close together, it is necessary to keep themfree oi" ashes, otherwise, under mgr-eat heat, the arches will cementtogether.

of the ehutments manner as to I mot-ion and a In addition to the above,this loose connection, both at bottom and top, allows the are selves toplace, as the furnace-walls expand or contract under difi'ercnttemperatures.

I do notclaini a fixed arch made in sections, as I am aware that thesame is not now.

What I claim as my invention, and desire to secure by Letters Patent, is

.The arch made in sections, A A, jointed at the crown by the cylindricalkeystone 13, and resting at the spring loosely upon the ways a a, thewhole so arranged that the arch, or either section thercot, can beadjusted hes to adapt thembodily in or out without elevating, and canbcreadily taken apart, as herein sot forth.

In witness whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses. i Witnesses:

O. E, Lsnss,

J. A. Boniionn.

or with a cyl-

